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The Collaborative International Dictionary of English v.0.48 (gcide)

Expire \Ex*pire"\, v. t. [imp. & p. p. {Expired}; p. pr & vb. n.
{Expiring}.] [L. expirare, exspirare, expiratum, exspiratum;
ex out spirare to breathe: cf. F. expirer. See {Spirit}.]
1. To breathe out; to emit from the lungs; to throw out from
the mouth or nostrils in the process of respiration; --
opposed to {inspire}.
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Anatomy exhibits the lungs in a continual motion of
inspiring and expiring air. --Harvey.
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This chafed the boar; his nostrils flames expire.
--Dryden.
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2. To give forth insensibly or gently, as a fluid or vapor;
to emit in minute particles; to exhale; as, the earth
expires a damp vapor; plants expire odors.
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The expiring of cold out of the inward parts of the
earth in winter. --Bacon.
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3. To emit; to give out. [Obs.] --Dryden.
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4. To bring to a close; to terminate. [Obs.]
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Expire the term
Of a despised life. --Shak.
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expired \expired\ adj.
having come to an end or become void after passage of a
period of time; as, an expired passport; caught driving with
an expired license. Opposite of {unexpired}.
[WordNet 1.5]